If you mean the one out of the book Dragon Magic, then no, it's not good. If you go into it from psychic warrior, then it's a decent psionic gish PrC (specializing in your claw/tail attacks from the diamond dragon), but if manifesting is your primary shtick, then stay far away. There is no good reason to miss two manifester levels for some abilities that eat up the points you would normally be spending on your manifesting.